Electric control system.



F. RIEBER.

ELECTRIC CONTROL SYSTEM.

APPLICATION FILED AUG. 11. I916.

E,2%,@a Patented May15,1917.

4[ 7 Mwwww WITNESS v INVENTORZ FEW/W1 E/EBE'R MAM BMW /175 A TTORNE Y5 'be made absolutely dark.

order that the patient and operator may find FRANK RIEBER, 015' SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO THE RIEIBER LABORA- TORIES, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

ELECTRIC CONTROL SYSTEM.

rezasco.

Specification of Letters Patent.

Patented May 15, 191?.

Application filed August 17, 1916. Serial No. 115,414.

To all whom it may concern:

Be it known that I F RANK RIEBER a citizen of the United States, and a resident of the city and county of San Francisco, State of California, have invented a certain new and useful Electric Control System, of which the following is a specification.

The invention relates to electric control systems and particularly to control systems for Rontgen fluoroscopic apparatus.

An object of the invention is to provide a simple means for simultaneously controlling the illumination of a fluoroscopic room and the energizing of the Rontgen tube.

Rontgen-ray apparatus for fluoroscopic purposes is commonly placed in a dark room in which the physician or operator must re main until satisfactory retinal accommodation is obtained to render the eyes sufficiently sensitive to conduct examination.

For practical reasons this room cannot It is necessary, in

their way about, to maintain the room normally in a state of faint illumination, preferably with red or reddish light. During the actual examination even this illumination is not permissible and the light must be turned off in some manner.

' To accomplish this, various switches have been devised which operate to simultaneously interrupt the lighting circuit and actuate the Rontgen-ray apparatus. Such switches have two sets of electrical connections in mechanical combination, and are connected with two supply circuits, thereby becoming unnecessarily complex to construct and connect.

In accordance with my invention I have provided a control circuit of such nature that a simple switch containing only one set of electrical contacts is used to control simultaneously the room and tube illumination.

The invention possesses other advantageous features, which, with the foreging, will be set forth at length in the following description where I shall outline in full that form of the invention which I have selected for illustration in the drawing accompanying and forming part of the present specification. In the drawingI have shown only one specific form of my invention but it is to be understood that I do not limit myself to such form.

The drawing is a diagrammatic representation. of the control system of my invention.

The Rontgen tube 2 is energized from the supply circuit 3-4, through the transformer 5. Arranged in the circuit 34: is the usual controlling rheostat 6 for the tube circuit. Arranged in the supply circuit is a switch 7, around which is shunted the lamp 8 which provides illumination for the fluoroscopic room. When the switch 7 is open the lamp is in series with the transformer and when the switch is closed the lamp circuit is short circuited. The resistance of the lamp may be very high in view of the low candle power required and this high resistance operates when the switch is open to allow only a very small amount of current to flow through the transfoimer, the current being such that the Rontgen tube is not energized. By closing the switch, the lamp is short circuited and the normal .current is applied to the transformer. In practice the switch 7 may advantageously take the form of a heavily constructed push button and may be arranged to be operated either bythe hand or foot of the operator.

A further advantage of my invention is that the lamp 8 operates to a certain extent to quench the spark formed at the switch 7, thereby permitting the safe use of a lightly constructed switc I claim: I

1. The combination with a Rontgen-ray tube and a circuit therefor, of a high resistance lamp in series in said circuit and means for shortcircuiting the lamp and causing the tube to be energized.

2. The combination with a transformer of a supply circuit connected to the primary of the transformer, a Rtintgen ray tube conmy hand at San Francisco, California, this- 10th day of August, 1916.

FRANK RIEBER.

In presence of H. G. Pnos'r. 

